<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .container{
            width:600px;
            height:700px;
            border:1px solid red;
        }
        .inner{
            width:200px;
            height: 250px;
            border:1px solid blue;
        }
        .inner2{
            /*相对定位，相对于自己原来的位置*/
            position: relative;
            top:-56px;
            border:1px solid green;
        }
    </style>
</head>
<body>
    <div class="container">
        <div  class="inner"></div>
        <div  class="inner"></div>
        <div  class="inner inner2"></div>
    </div>
</body>
</html>